chore: use Rolldown bundle analyzer instead of rollup-plugin-visualizer

[stipsan]

Replace rollup-plugin-visualizer in the demo Vite config with Rolldown’s built-in bundleAnalyzerPlugin.

Vite 8 already bundles with Rolldown, so analysis now comes from rolldown/experimental instead of a Rollup visualizer plugin. After pnpm build:demo, the report is emitted as demo/dist/analyze-data.json (JSON by default) instead of stats.html.

rolldown is added as a direct devDependency at ~1.1.5 so it matches the version Vite 8.1.5 uses. That keeps instanceof BuiltinPlugin working under pnpm’s strict resolution.

Verified locally:

• pnpm build:demo emits demo/dist/analyze-data.json
• pnpm lint, pnpm type-check, and pnpm test pass

  

[changeset-bot]

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